Identity of the Distal Segments of the Maxilla 2 and Maxilliped in Copepods: New Teeth for Carl Glaus' Old Saw
نویسنده
چکیده
Interpretations by Glaus and Giesbrccht of the identity of the distal segments of the maxilla 2 and maxillipcd in eopepods arc reviewed. 'I'he developmental pattern of setal additions to these appendages suggests that the distal segments of maxilla 2 arc exopodal, while those of the maxillipcd are endopodal; these data are consistent with the interpretation of Glaus. Information about the genetic regulation of development of a fruitlly, and a reintcrpretation ofa fossil arthropod also support Glaus. A general hypothesis identifies a compartment with a contralateral pair of uniramal limbs as the basic division of the body of an ancestral arthropod. Somites, crustacean biramal appendages, and insect uniramal appendages arc derived. The general hypothesis is used to explain the structure ofa copepod including maxilla 2 and maxillipcd.
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